HTTP Header Inspector Tool

HTTP Header Inspector

Analyze HTTP response headers to improve your website's security, performance, and SEO.

Understanding HTTP Headers

HTTP headers provide essential information about requests and responses in web communications. They help control caching, security, authentication, and content negotiation between clients and servers.

Common HTTP Headers

Security Headers

  • Content-Security-Policy: Controls resources the browser is allowed to load
  • Strict-Transport-Security: Forces HTTPS connections
  • X-Content-Type-Options: Prevents MIME type sniffing
  • X-Frame-Options: Prevents clickjacking attacks

Caching Headers

  • Cache-Control: Directives for caching mechanisms
  • ETag: Validator for conditional requests
  • Expires: Date/time after which the response is considered stale
  • Last-Modified: Last modification date of the resource

CORS Headers

  • Access-Control-Allow-Origin: Domains that can access the resource
  • Access-Control-Allow-Methods: HTTP methods allowed when accessing the resource
  • Access-Control-Allow-Headers: Headers that can be used in the request

Content Headers

  • Content-Type: MIME type of the response content
  • Content-Length: Size of the response body in bytes
  • Content-Encoding: Compression algorithm used
  • Content-Language: Intended language for the audience

Why Headers Matter

  • Security: Proper headers can prevent XSS, CSRF, and other security vulnerabilities.
  • Performance: Caching headers can significantly improve load times and reduce server load.
  • SEO: Headers like Content-Type and status codes affect how search engines interpret your content.
  • Cross-Origin Interactions: CORS headers control how your resources can be accessed from other domains.

Use our HTTP Header Inspector tool to analyze your website's headers and ensure they're optimized for security, performance, and SEO.